Figure 10  Graph of the transmittance data for a pristine substrate, and the substrates of Figure 9a,b showing the improvement in optical transparancy after cyclohexane vapor post-treatment. The red line is for pristine COC, the green line for milled COC, and the blue line for cyclohexane vapor post-treated COC. Measurements are done with a Woollam M-2000UI ellipsometer in transmittance mode.